如何在JSF中的h：dataTable中显示来自其他db表的数据？

I've a datatable which is binded to a database table. In each row, I want to show data from other table based on the current row ID (I'll do that). How can I do that? For example, if I have user's table I'd like to show all groups of the user in each table row. How can I create a method that is called on each table row?I've a datatable which is binded to a database